G - Physics – 11 – B
Patent
G - Physics
11
B
330/38, 352/19.3
G11B 5/02 (2006.01) G11B 20/10 (2006.01) H03G 3/20 (2006.01) H03G 3/30 (2006.01)
Patent
CA 1063717
Abstract of the Disclosure A multistage amplifier having an automatically programmable gain is disclosed in which the amplifier gain is incremented in binary steps to a desired level. Each amplifier stage is switchable between a first and second gain in a binary sequence such that the four digit output of a sixteen bit counter will increment the total amplifier gain in sixteen binary steps. A readback and decoding circuit for reading magnetic tape is also disclosed in which the signal ampli- tude of data read fro the magnetic tape is compared to a reference voltage which corresponds to the data readback clipping level. Only amplified data which exceeds the predetermined clipping level is gated out of the circuit for processing. Since input signal amplitude varies for tape to tape and fro head to head, the automatic read amplifica- tion burst on each tape is used to preset the amplifier gain such that the amplified amplitude of the readback signal is maintained constant as long as the readback signal supplied to the amplifier is within a predetermined range. The amplifier gain is automatically incremented until the amplifier output exceeds the clipping level, thereby insur- ing that only valid data and not noise or undecodable data are processed.
245554
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